ABB 5SHY3545L0010 3BHB13088R0001 3BHE009681R0101 GVC750BE101 励磁控制单元

确定未来功率半导体通常是设计的第一步电力电子设备。5SHY3545L0010 3BHB013088R0001如果额定值太接近操作值故障的风险将很大，

对设备可用性产生不利影响。如果选择了额定电压，总体而言，安全余量过大

效率和性能将受到影响，因为更高额定设备需要：硅越厚，产生的功率越高损失。

1.导言

5SHY3545L0010 3BHB013088R0001供电网络条件和设备设计均决定

半导体将暴露的预期电压。没有简单的规则涵盖所有应用程序和

评级必须根据具体情况确定。本申请说明

通过根据年份对最常见变频器类型的各种建议进行整理，为电压选择提供指导

电力电子领域的经验。

这些建议仅适用于单个设备。复杂性

设备串联引入不在范围内

本应用说明的。

1.1.参数定义3BHE009681R0101 GVC750BE101

以下数据表中定义了几种阻断电压：

高功率半导体。各种

本节对评级进行了说明。当然，

标准化，可在各种国际标准中找到

例如IEC 60747。

区分重复过电压非常重要

VDR/VRR（在线路频率出现的换向过电压）和出现的非重复过电压浪涌VDS/VRS

应用说明53BHE009681R0101 GVC750BE101随机地（例如，由于雷电和网络瞬态）。

单个电压浪涌过高将导致半导体雪崩击穿，重复电压峰值过高

即使这些重复电压的电压水平低于雪崩击穿极限，也可能导致热“失控”。直流电压以不同的方式对半导体施加应力，将对此进行解释后来

The circuit designer encounters the problem of over-voltages in two different electrical contexts.The first,which may be referred to as a«controlled environment»is one in which a transient is generated within a known piece of equipment and by a specific circuit component,such as a mechanical or solid state switch operating in an inductive circuit.Such transients can be quantified in current,voltage,time and wave-shape by circuit analysis or measurement.In these circumstances the electrical environment is known or«controlled».By contrast,the second case,considered to be an«uncontrolled environment»defies circuit analysis and also,in general,measurement.This is the case of equipments peripheral to large distributed networks such as power grids.Such«infinitely»distributed networks act as vast«aerials»capturing and transmitting electrical disturbances either from lightning strokes,distribution faults or load-switching by other users.The rational choice of semiconductor voltage rating in such environments starts with a statistical knowledge of the transients in the system.It should be noted that IEC 60664 uses the terms«controlled»and«uncontrolled»in a wider sense to differentiate between systems where transients are completely unknown(unprotected,line-operated)and those where they are either known(internally generated)or limited to well defined levels(protected line-operated systems).